var dtime = '_deadtime';

//设置缓存
function cachePut(k, v, t) {
  wx.setStorageSync(k,v)
  var seconds = parseInt(t);
  if (seconds > 0) {
    var timestamp = Date.parse(new Date());
    timestamp = timestamp / 1000 + seconds;
    wx.setStorageSync(k + dtime, timestamp + "")
  } else {
    wx.removeStorageSync(k + dtime)
  }
}

//获取缓存
function cacheGet(k, def) {
  var deadtime = parseInt(wx.getStorageSync(k + dtime))
  if (deadtime) {
    if (parseInt(deadtime) < Date.parse(new Date()) / 1000) {
      if (def) { return def; } else { return; }
    }
  }
  var res = wx.getStorageSync(k);
  if (res) {
    return res;
  } else {
    return def;
  }
}

//删除指定缓冲
function cacheRem(k) {
  wx.removeStorageSync(k);
  wx.removeStorageSync(k + dtime);
}

//清空所有缓存
function cacheClear() {
  wx.clearStorageSync();
}

module.exports = {
  cachePut: cachePut,
  cacheGet: cacheGet,
  cacheRem: cacheRem,
  cacheClear: cacheClear,
}